How indentify the attack author ?

If you still don't want to use a firewall , theres a small software called NukeNabber which will identify the address of the nuker. Warning, it won't protect you (if you doubt this , please read it's documentation) ! This software will give you the IP address of the opponent and log the nukings (supposing it's usefull).

Check that your system is patched before using NukeNabber !!

NukeNabber 2.9b for Windows95/NT is here ! Download nukenabber now ! (nn29.exe 749k 14-4-99)

Additionnal sounds - Cool sounds to use with NukeNabber.

Am I enough protected ?

The only true (real) protection is a firewall.